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I am trying to get sound out from a Raspberry Pi zero with RaspiOS bullseye. I have enabled the alternate functions and use a RC filter to get an audio signal to some earbuds. However when I try to play anything using aplay it doesn't work.

I have the following clues:

I made sure that dtparam=audio=on is present on config.txt.

When I try to force 3.5mm from raspi-config menu it seems that there is some problem. When I click "S2 Audio" the screen flashes for a few seconds and it goes back to the main raspi-config page.

When I try alsamixer I only get HDMI as an option. The same happens when I run aplay -l

Any idea on what can be wrong? I tried reinstalling the OS several times and it didn't help.

2 Answers 2

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You need to add the following to config.txt (assuming you are using PWM 12 and 13):

dtoverlay=audremap,pins_12_13

Test using:

speaker-test -c2

Info:

pi@raspberrypi:~ $ dtoverlay -h audremap
Name:   audremap

Info:   Switches PWM sound output to GPIOs on the 40-pin header

Usage:  dtoverlay=audremap,<param>=<val>

Params: swap_lr                 Reverse the channel allocation, which will also
                                swap the audio jack outputs (default off)
        enable_jack             Don't switch off the audio jack output
                                (default off)
        pins_12_13              Select GPIOs 12 & 13 (default)
        pins_18_19              Select GPIOs 18 & 19
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I had success by adding the following to config.txt:

note this only enables audio out on GPIO 18 which is the only output available on all models (see README.TXT in config.txt directory

Enable audio (loads snd_bcm2835)

dtparam=audio=on dtoverlay=audremap,enable_jack dtoverlay=pwm-2chan,pin=18,func=2


Until I added the "enable_jack" parameter, the only audio out option was the HDMI option... 

The "pins_18_19" did not work , had to use the `dtoverlay=pwm-2chan,pin=18,func=2`

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